Wrench



(No Model.)

H.- J. MARTIN.

WRENCH.

No. 557,311 PatentedMaJr. 31, 1896.

I UNITED STATES PATENT OFFICE.

HENRY J. MARTIN, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE VHITMAN & BARNES MANUFACTURING COMPANY, OF AKRON, OHIO.

WRENCH.

SPECIFICATION forming part of Letters Patent No. 557,311, dated March 31, 1896.

Application filed December 20, 1895. Serial No. 572,734. (No model.)

To all whom it may concern:

Be it known that I, HENRY J. MAR IN, a citizen of the United States, residing in the city of Chicago, county of Cook, and State of Illinois,-have invented a certain new and useful Improvement in renches, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings.

The object of my invention is to provide a wrench of the monkey-wrench type which will be economical in construction and efficient in service, and, while having the adj usting parts so placed as not to be liable to be battered or disarranged, may be conveniently assembled and easily taken apart for cleaning or other purposes.

My invention contemplates making a wrench of unusual lightness and simplicity, while having all necessary strength.

It consists of a stationary jaw, from which extends a bar along which a movable jaw slides, there being formed internal teeth on the walls of a hole through said bar, and the movable jaw being provided with a revoluble worm engaging with these teeth, the teeth being so formed as not to prevent the free insertion and withdrawal of the worm, and the worm being held in a peculiar manner enabling its easy removal and allowing greater strength in the wrench.

My invention is more fully specified in the following description and is definitely pointed out in the claim.

The drawings show the best embodiment of myinvention at present known to me.

Figure 1 is a side view of my improved wrench. Fig. 2 is a transverse section of the same, taken on the line 2 2 of Fig. 1. Fig. 3 is a longitudinal section taken on the line 3 3 of Fig. 1. Fig. 4is an end view of the movable jaw with the other parts removed.

a is a bar which serves both as a handle of the wrench and as a guide-bar for the movable jaw. The stationary jaw b is attached to the end of this bar, the two being preferably made of one piece of metal. For convenience and lightness I make a groove 0 in each side of the bar a. If the bar, with its stationary jaw, is drop-forged, which I consider the preferable method of making it,

i this groove is formed in the bar at the same time. Extending through this bar is the elongated hole d, on the longitudinal walls of which are formed the teeth 6. is made with a sleeve g, which closely surrounds the bar a and is slidable thereon. A hole h is formed through this movable jaw, and in it lies the worm 1 revolving on the journal-pin j. The thread of this worm engages with the teeth 6 on the bar, and hence as the .worm is revolved causes the movable jaw to approach or recede from the fixed jaw. The edge of the thread on this worm is milled, as shown, for convenient turning by the fingers. The journal-pin j, on which the worm revolves, has its shank enlarged near its head and a thread Z turned thereon, which cooperates with a corresponding thread in the sleeve g. Thus the journal-pin is held in place by engagement with the end of the sleeve 9 which is opposite the jaws and need not extend in the direction of the jaws beyond the worm, therebyleaving an unobstructed recess in the sleeve g at the jaw end thereof, which, being able to pass over the whole cross-section of the bar a, does not require the hole in said bar to be out near enough to the fixed jaw to weaken the wrench. The construction here shown also allows the sleeve of the movable jaw to be very conveniently formed by simply drilling three holes longitudinally through the same and cutting out the partitions between them.

In securing together the parts of the wrench the movable jaw is first placed upon the bar and allowed to assume a position against the fixed jaw. The worm is then slipped into the recess in the movable jaw and the pivot-pin screwed into place by means of a screw-driver elongated hole through it, said hole not ap- The movable jaw f proaching the stationary jaw sufficiently to Weaken the wrench, teeth formed on the 10ngitudinal walls of said hole, and a movable jaw having a sleeve surrounding said bar, there being formed a transverse hole through said sleeve in which lies a worm the thread of which engages the teeth on said bar, the surfaces forming the tops and sides of said teeth and the bottom of the spaces between them being composed of substantially straight lines running across the bar, whereby there shall be no tendency of the teeth to bind or prevent the free insertion and removal of the worm, the said worm being held by a journal-pin screwed into said sleeve by means of a thread formed on an enlarged shank at the head end of said journal-pin, said journalpin not extending substantially beyond the worm whereby the jaw end of the sleeve is open and unobstructed and able to pass over 20 HENRY J. MARTIN. Witnesses:

CHARLES L. HINE, ALBERT H. BATES. 

